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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe5bcab35ab996bd7a5ecc5002ff9683ce6f4d1fed231b38f9939cc0126a656' 
  AND token = 'suwHl5s2BARuAj7f/259Hdi5gWBzZOmmFvA62jun86o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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