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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94d1bc5345d55e2355b1805791af9d068c79f440aee57ab4482b980541a4097' 
  AND token = 'wklK9pNYN3WK7K+G7DJ4NaSgBsToxm1DybMD+4OKFo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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