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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b655fe0d17274faf42b03a57b7af9c752236a342c9ab81302f1a6dd32bf1f3e1' 
  AND token = '7WuPjNuEA2vXNhhnJjv8pwE4sa6ZnDccNjzgMHPUUIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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