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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa4bd8322b1bfbc4ae2550e3ef08c1ec076814e4346a2362a84f5541b8e0846' 
  AND token = 'iKMh+l/e7OC0g3l4JUSvOfp3cPLAT+GPu4Hj9Ae6mYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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