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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0862f7cbaea7d46cbdfe928dd0b0ea3f364a93813cdf719a28e718dfb59f3270' 
  AND token = 'YOEn978H/HRBezAEUBE3VtpI2a8lM5gzE4sNN+UJqNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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