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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312ec4198e16b5fd9219d8a90332c8ed5dcf3316ab1d3e628e3dcd9861733d9c' 
  AND token = 'n8NU15QDL0Fw8vdjlMUymD5s6u0i/KNmKOPHycBhjt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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