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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4190a3aa8536e726b8ee7f82aedce02ed90ac58ff9ab8e717318ae5dc41ea0e6' 
  AND token = 'XYFvnapzmbfkH2HL+kRlR7Q3rzUHAI325ELe7HfVuew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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