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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44f7dabe2243a9342fa489065606cb9686214f0b234f2ac42d6b2d05e493e74' 
  AND token = 'DzwVoyh6th276mRWvXzI9prbmz3o2KYOv2KzZ/S4vgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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