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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ced08d2bc86f43c725f7f2d49084d43c3135cccd57c738586c3c8aedc732ab' 
  AND token = '0NPHhauE9XHWOG5ZRcF1qlMI6hrrxrN/dDr430YqVf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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