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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33399613ae9008e9bd5adc852943a891ea34d1c71b517bd9f145028f61ac2df3' 
  AND token = 'aS7zztNXv8DPax0Mnmor0tvr4RPfTNTuFUMtBqY/9dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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