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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5d7f1e64c220cbd11cc5e1f8746941309df100b5841c20bed8bf76a3999cf3' 
  AND token = 'xuZITYTo6d2Z4EuoVpisOQ6VAF8/K/krw06BVwR8o3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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