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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85084af6771317b633e203d0455d12dd95f5e392cf813711f737d14ff7b857c5' 
  AND token = 'DzWNFyCYZolMA1JCFr2AzTQLOsxbwrV5E5s52Ccs8ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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