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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550bd4b02d4c8e79baa61721ec6a63012e1d71ca0a7270df37f518af807e53c2' 
  AND token = '3ubCHttcbk94G2rD1Gc8+vAhpV0OFrgnJg/S2Pmox/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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