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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d77ae0bba9d6caf97e5f1c0787b8c4f2d2f24dc252a8b95b8b290f47766e41' 
  AND token = 'eDbxuAEsP3M8jGhWuj6Epl0gLuHEBRZjhdfcjX3Nmyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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