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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd259a09a654513244f8403e8dc39dfa494ff6dee5ce76c1a3cb305dcd22fefe9' 
  AND token = 'WOK8FrxMxELUV1YkEC8gmQy+PUuamkun74AMXbeJlIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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