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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7fcca52b161af9c666d50923249adf155fbc1d6afe91e9c5babbd280953010' 
  AND token = 'ZR2FFdII3uR07WWm1m5Ab0bGQbwbEL7X/7d2Hp/ZnoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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