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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ecfcaa9d494ea8132ad35aa8c1530ef6752bc097c24e3f7641ea018a8df997' 
  AND token = 'ZEl0qkYNP63zEMOajr88hIKylhOhwsz+WPTchdCW6TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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