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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed83a2ffc59c99dca30564e6d3c26432c6d9d2298240dec08bc0b1ddbee705a' 
  AND token = 'UxgpzLNHmkyT+/poFi3udKXTx+hPVaG5bOrbB7mRf28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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