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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058bcdd61405f995011555540e556d4d8f2294e010d8c33aef40c55a413f7b55' 
  AND token = '1lk4/TWmYzRBDGEjIC0my/z1fMfPzasFOMu7mOdLWiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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