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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f632bda3bfba7fcb7d8548f4c3d9a1fcfff309c833a0f2ca7cf9b391fd27bc50' 
  AND token = '3Y1L2cInZYKn1SBJr7gthgM9Rn3zoJ6p7C4Yx4sTsdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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