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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea0d72cfd17719187fcace2e7c207725d6cfaaae5ee95cb36883a7f8fae5c9b' 
  AND token = 'faOs0qdcci853NmsIC5WE7laThFgSWQd2wNxfczyIVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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