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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829f442b01acf4c03b3340d42a9aeee5a1c834e09dfe85bd35f4dc12b429bb34' 
  AND token = 'ffRHueKOzbWQB8Ue45K73y7aP6njAT2pff45h1Bp7GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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