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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8dae666157a3fdd1ec9d2d13296cebd91bc270a3873e9fe7db92fea23db29a' 
  AND token = 'o40RlNebi5eJkHOp+QIXvDZWA9leUKhvwzT6JoOwT1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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