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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed13050330474da35500e4506ef714d6e5b6d945af5375e8a69158d29ce9c75d' 
  AND token = 'X5XU8R7lXKjZrmmyBk/wU79TUYpvbgTm0nudCyTZ/xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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