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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4952131633c6d535a01d3dab1d6adb1bed29016e68b44a04d4d003a51580bb' 
  AND token = 'qBPjghL+T51XnnRH3gvambLOO+D2GHj34j1xzDxM+Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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