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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fae1f439cb705131ceb234f9d16d849c518d3e93714123b6c2c1837f733ad1e' 
  AND token = 'wh279bD0KJLFu4HzR/0Z5VAe37xyYyYD1qjag0GS1n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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