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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46d14119377a3534ab6d11982d5d7ada7fdacaaf6ef28004c4f4d517c5251c0' 
  AND token = 'AQz6y/jarA6Co/+yfs5ML+Vu610+lzs7L/Z9G3pUco0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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