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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d71ad91e903b69bc5b02d4e7dcc292554f421c5643fb4f0ecec7890469383b0' 
  AND token = '/xZ3x+I9/205+oJAw44QY3wxicJYfNX1nMlykQjoqQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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