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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcd970d8c1b52a2bcf65f5e08ba8dcdbcc0eb073082375be1ef524b37c0a03a' 
  AND token = 'g1wJh5NG9agRIpgPP7x1zoMLu6tK9opIGYUwggv7LOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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