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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0888477ec3742c25d40e41d288bec6612814d33e2ee6f0d3f577ed29683e8bdb' 
  AND token = '+lwzsuyAhPtAXw6RZxDTF+8G3pGfNU+usarAMQozthQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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