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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70547837ba9acde379dae61335b475e7a4810ef9c7451f930f444b18a136fb4' 
  AND token = 'kTZcE6sCpBr0wLSHOrxW1ocatDiodBy2IjuFkM7Uz3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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