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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a121cd8701efce061ec5c777ecf1bd136f138e93b2eca33edfbc2a2f513ef84' 
  AND token = 'JW/8FkNl5vLT2fK/qoQ/wLtfcKVTd4iMwDFLBrzj8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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