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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f4109fcd52aec6d6489b5ca9b763ea498603cad69aa2a7160d3eb13d2a1dd9' 
  AND token = 'DFLbGmUWSfV7dPRUmO7RXaiTOL/v2ZVFTcufiJIA0xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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