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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1654d2d6636aa91ec587521855404a874bb11d10c8495161194fb54969c9688b' 
  AND token = 'gWL+gq0MGfaJLGWmaMHIIHLa16U2LZQWKxYdug+ZwPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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