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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95070fdd5294b3abb1e0189969cf3b3df3e7b49d8b4cbe662686a420be2c5b22' 
  AND token = 'l73TjW36F2DCwRx51jjcAIn0ij3rhmpzyhsPMPtc5bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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