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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530d4bf9876c09f0ededc6940216e3fb2a17a955f0b5c7c66ec367776af55ba4' 
  AND token = 'n/Ht2PvA5ASEuk9fg/AnvJ1ii0LuQYLeVsVTv+m0QVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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