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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f89763c4521e6b7b9ae9ab190fad20952a5dca8e4d06c276fbf05765615cc6' 
  AND token = 'bcrk3KAeiRuxwz5j9DJ+PDHNKh4CPU7jJu3P/OkhGlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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