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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36216d24627dbe0c4c6d40eab40cfa5b16ac7e8f577d883bb6439e708525274' 
  AND token = 'gLO0Mc/nOWEE73dtNm/Y8FafZFOUPBo4N2HH4dRsJZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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