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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d618220d4241e7a3b0a081ef5f8826fcd6ef6af1d5907a2f798ac8ecebec3b1' 
  AND token = 'hiReGKCZDkHOcjt1fGuM5dOLnfJAxZnNkFFX2B61104=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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