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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d20aca7e48693941e74dedebe2a559fb23c149056a1f9c027d8c4a803e54065' 
  AND token = 'uC5CNFJR3+rhSnB9/g26ygeZ/UTsepD3u0biNN0OTqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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