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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdf2943877225a1f78e1daa3db00a21835cae581ccdbbaa85d53ccd1b2c0872' 
  AND token = 'RZmJuV5HOCy+g4GIbfsRfWD60uLqT3p0iNcgZp4I0QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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