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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10939e410255791498e7a4304430d211546483a9c74b125d2aaea8f61ebdd00' 
  AND token = 'ywhxhUZelkFroX48oaR1YyXV2VpGlch9mAwUe32dNtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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