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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64c7f144d30186c0f3316a6e29baaa0a690fbabe216556002afb74b63de110b' 
  AND token = 'gkIRex653MoTasWhQMNs4bYzSxjtaSoF6G80J6Lf3To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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