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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb336b238bfd8e988e9ab1552e120aea160b616d6992ffca83ba3b151696ecf' 
  AND token = 'gM+syiYL5iG0D+Y1D5UfHVZVzlin018qgX5eIl2ZoP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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