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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c0ac2dd0f256e69ffa9d6cdc317d5aef34886cd4f7e6e81fe371f1d3b1d39f' 
  AND token = 'L9fzX8aW7IV3nzU9VJhBKLR0baWFrFop2NqxTyziyIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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