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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d67a3e4a2a53367b2072e7bd2f1aa5fe5603464f9bdef379830cf7d4ed00bc4' 
  AND token = '6b/Mb0WErfeN+Y+voD0kogXVE7ovGiFqtBOgcKpsX/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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