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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cc71fddc87647aacc42496aa2aea53c4a70d64bf072cca41f90419bc652e5b' 
  AND token = 'Mbec490M9cJveYZ7XffQNSbi6MdO/2VPyVw4S5OiO9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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