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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dbf4aae5ff5cb236b7f9ee2a8a97a1059d2c73fa50e663c4db9e1a9a9c5b52' 
  AND token = 'hUYMqBN0Uru2hXmERE9Li7IG0e87surlXkmkRi7OHUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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