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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fca576df6c30f57ee58a86a60410f3a0da0ed41ed0d3c16df405ca1f73ca70e' 
  AND token = 'uBHni2odFz4JcaVIgDmkb+137HSGGfAVLPLwRp2msPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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