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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7109521eb510d24a715eff7a0b70c199ded36e2e666af8f7d7bf17947acdb944' 
  AND token = 'kBF4gsATTztH5EA4noPG8xaWjhGVJBHTVeXs/WgckVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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