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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43503a378277b12fc296cbec41c949caffce0b590d96151f53152b5dbea548f' 
  AND token = 'Bc0WqDVuRuRLRq8Qwkyp2GocAJVoXF1kA+8wU93wjII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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