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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127227e16ee4061361ca09da0f83877337d94d61fea940cefdd8afb75dbe93c5' 
  AND token = 'hZ5rXINA6V0+j75PPmwyCwCrLry/Bp5Joj53HPk1VkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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