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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad467eb28ff7273da4185444a9a37b8a2ae6530d2c7d2a9cc052dfba649ff40' 
  AND token = '9nzPK/4GjBCmNUEMXE6tzpNPyMkWLYUstA/rNgL/L/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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