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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc26cdd7d7dfeed80997c6861d5c786ac1dec0d378978afe76453a5c16940c62' 
  AND token = '9VYNJJMrqHG86KKs8JRfkNgJ7552QZ5e/8ZY+ufZt+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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