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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2429ccf782b4f953790055c077dd1debca1718c742631c485a0f773e03fd484' 
  AND token = 'tU4zWvsBh2NlrF+Vis6MPf9+y0RkE4sgoLTkFftlvtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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