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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b930de2085d0cf2cd527287a438328048c716730f1ebb2f2c3b5df9e614a0aa3' 
  AND token = 'hIK2Et0L6o1/DXPxKQx0Q9pDB2FsXSlZNRP4Q9aj6Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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