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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811d79a4c069efcd08f1c1c33f15d1baa991a84ca06a239349594a553f9e4671' 
  AND token = 'WFo62yoCixIr/b2cneEZiaX73RvC4Z2rqsNVkzv/YZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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