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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfb24c04ca8639fd71443c039b90a032e15f8cf2e0a11e56df9ade7e16cbc9e' 
  AND token = 'BqKu2pGxIQPnuhVNce9OzEWaxUL4nnNOQ8a9pZbdtGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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