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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b7e14491af6992d298b2911dba53969b70c9e98543729f8324cb344a03a644' 
  AND token = '+gO2e0HoDy5HrwmDI5bADL0l4CMtSKCWiQr8qk2p++c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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