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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1d5fd3b5c8c5da70835bbc27299222a3b1a1af2633a5de86c0f27cb9016314' 
  AND token = 'kNv1wXoru8Fc9yvMDbbyW2hMzPc2Z11moPKcij6pmH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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