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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034de4ef16a22fa4bc4c083ddb4fc42764c83a62fb7e22f4fb38304c4be44129' 
  AND token = 'm9sBeIFCQgCfmwBH2M3iEeEinmYAmxXxJ+oJI8AnQgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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