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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d9557a704b32cea3bcd13dd6cf199d7ec8640c1ba732d246c0eaa09011354c' 
  AND token = 'FEl8q/ccm+vm+3bdR515rPKoNozywoDPh8IjULeh83M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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