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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea9ef48a4d4bc0c81e0bad68504c4e08f5cde9fa86cbbcf1b845286a870f3b2' 
  AND token = 'g5NDChBeEtNF8PwKAx54a2AKmQwrnMwt+6iihYB41+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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