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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3eb0478315b1eb52a5351494222b4b66bac93a66f0ed46ed3872c7dd8749ec' 
  AND token = 'XOUmG0jnX4rXrw6giOtt71BPVN4w+M4UhWj/p2Vh2ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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