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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525f742c878dbeba03943d88c1a20b0b0e0d3a816ec90d5872839ee64808ce76' 
  AND token = 'GX3zGr6cmlOJbLriKMB4R/WNdBJpXqt8TGFGE4bjaCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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