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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358ac963ea7b1989295faf87426b1a38ef5098d4d365637898b0c3c7dc9c33fe' 
  AND token = 'Rgeac6ofwZkhkdsW2cLg378yxLCHjk8gGKV+PrVHXs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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