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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900cf99541bb9e7ac6713025afa2c77bf3e8682f65b0c3fec28b58e22a0e02e6' 
  AND token = 'xuyb8ODxhmlk1wJB8OgcsyDCmc8q9qn6IPt1ALyxd28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}