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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125ff015ef6fc27a5e908c829e258eae515674c5b561d841fbf8cbe515cf5028' 
  AND token = 'VCgI9yBya/wRx7v9BFmFJ4NbpfSRNQyamBPcp96uYxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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