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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8abf91224936f7b55df10d075fbcc9c3186968f81d3de64aec5d4ef932728b' 
  AND token = 'c7vz3TRN1z+xdp+O32DgdWZzcq2Q5WRf8CfUSDQrsSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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